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SOARES, D.R. ; SCHWARTZKOPF-GENSWEIN, K.S.; SANT’ANNA, A.C.; VALENTE, T.S.;
RUEDA, P.M.; CYRILLO, J.N.S.G.; PARANHOS DA COSTA, M.J.R.; [2011]. Lack of the
expressive associations between temperament, aggression and weight gain in finishing weight feedlot
cattle. In: ASAS – Joint Annual Meeting, 2011, New Orleans, LA, EUA. J. Anim. Sci. Vol. 89, 8 p.,
Disponível em: < http://jtmtg.org/2011/toc.asp > Acesso em: 05/10/2011.
LACK OF THE EXPRESSIVE ASSOCIATIONS BETWEEN TEMPERAMENT,
AGGRESSION AND WEIGHT GAIN IN FINISHING WEIGHT FEEDLOT CATTLE.
D.R. Soares*1, K. Schwartzkopf-Genswein2, A. C. Sant’anna1, T. da Silva Valente1, P. M. Rueda1, J.
N. dos Santos Gonçalves Cyrilo3, and M. J. R. P. da Costa4,
1
Sao Paulo State University, Animal Science Posgraduation, Jaboticabal, Sao Paulo, Brazil,
Agriculture and Agri–Food Canada, Lethbridge Research Centre, Lethbridge, Alberta, Canada,
3
Animal Science Institut of Sertaozinho, Sertaozinho, São Paulo, Brazil,
4
Animal Science Department, Sao Paulo State University, Jaboticabal, Sao Paulo, Brazil.
2
Key words: behavior, confinement, reactivity
The aim of this study was to determine the relationship between temperament, aggressive behavior
and average daily gain (ADG), in feedlot cattle. Behavioral observations were conducted for 10 d
(0700 to 1800) using a continuous sampling method. Fifty–3 bulls (35 Nelore and 18 Nelore cross
with an average age of 30 ± 3 mo.) were observed in one feedlot pen. The frequencies of 2 types of
aggressive behavior were recorded: displacement (DISP; physical contact where the initiator pushed
with his head, horn or body resulting in a change in the receivers position) and non-displacement
(NDISP; as described above, without any change of the receivers position). Temperament was
assessed, in the pen during at weights registers on d 1, d 29 and d 54 at the end of fattening period,
using flight distance (FD: proximity (m) to which a stock person could come to an individual animal
before it would move away) and flight speed (FS: speed (m/s) at which the animal exited a handling
chute). Average daily gain was calculated using animal weights obtained on d 1 and d 54 at the end of
the fattening period and Pearson correlation coefficients were estimated for all variables. There were
significant positive correlations (P < 0.05) between FD and FS (r = 0.58), DISP and NDISP (r = 0.74)
and negative correlations between NDISP and FS (r = –0.29). No correlations (P > 0.05) were observed
between NDISP and FD (r = –0.17), DISP and FD (r = –0.06), DISP and FS (r = –0.13), or between
ADG and any of the other variables (NDISP: r = 0.07, DISP: r = 0.03, FD: r = 0.09 and FS: r = –0.03).
Based on these results we conclude that there is no expressive association between temperament, intraspecific aggression, or ADG.
Financial support: CNPq and ETCO Group.
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